FIREBASE WARNING: Exception thrown by user callback

[r3wt]

The paginator works fine. I currently has 33 items in the node I am paginating. The page size is 30. when i attempt to navigate to the 2nd page, which should have 3 items, the following error is displayed in the console:

FIREBASE WARNING: Exception was thrown by user callback. Qh@http://localhost:3000/dist/firebase/firebase.js:472:117
g.Nd@http://localhost:3000/dist/firebase/firebase.js:482:298
require<[4]</n.prototype._queryRef@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:8842
require<[4]</n.prototype._subscribe@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:9299
require<[4]</n.prototype._listen/<@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:10200
require<[4]</n.prototype._grow/<@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:8596
c@http://localhost:3000/dist/firebase/firebase.js:477:56
g.Tb/<@http://localhost:3000/dist/firebase/firebase.js:437:829
fc@http://localhost:3000/dist/firebase/firebase.js:301:165
bf@http://localhost:3000/dist/firebase/firebase.js:366:215
af@http://localhost:3000/dist/firebase/firebase.js:365:343
Fh@http://localhost:3000/dist/firebase/firebase.js:460:426
g.gc@http://localhost:3000/dist/firebase/firebase.js:475:140
g.$f@http://localhost:3000/dist/firebase/firebase.js:477:246
require<[4]</n.prototype._grow@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:8200
require<[4]</n.prototype._listen@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:10150
require<[4]</n.prototype.goTo@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:7251
require<[3]</n.prototype.moveTo@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:2857
require<[5]</n.prototype._pageChange@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:13602
require<[5]</n.prototype.setPage@http://localhost:3000/dist/custom/firebase-util-paginate.min.js:9:11931
list.go@http://localhost:3000/dist/custom/firebasePaginator.js:43:4
anonymous/fn@http://localhost:3000/dist/angular/angular.js line 15358 > Function:2:259
ngEventHandler/</callback@http://localhost:3000/dist/angular/angular.js:26994:17
$RootScopeProvider/this.$get</Scope.prototype.$eval@http://localhost:3000/dist/angular/angular.js:18161:16
$RootScopeProvider/this.$get</Scope.prototype.$apply@http://localhost:3000/dist/angular/angular.js:18261:20
ngEventHandler/<@http://localhost:3000/dist/angular/angular.js:26999:17
defaultHandlerWrapper@http://localhost:3000/dist/angular/angular.js:3734:3
createEventHandler/eventHandler@http://localhost:3000/dist/angular/angular.js:3722:9

I'm using a thin wrapper around this library:

angular.module('firebasePaginator',[])
.factory('$firebasePaginator',function($firebaseArray){
	
	return function(ref, field, pageSize, cb) {
		
		cb = cb|| function(){};
		// create a Paginate reference
		var pageRef = new firebase.util.Paginate(ref, field, {maxCacheSize: 250,pageSize: pageSize});
		// generate a synchronized array using the special page ref
		var list = $firebaseArray(pageRef);
		
		list.loaded = false;
		// store the "page" scope on the synchronized array for easy access
		list.currentPage = 1;
		list.ref = pageRef;
		list.ready = false;
		
		list.$loaded().then(function(){
			list.loaded = true;
			cb(list);
		});
		
		pageRef.page.onPageCount(function(currentPageCount, couldHaveMore) {
		  list.pageCount = currentPageCount;
		  list.couldHaveMore = couldHaveMore;
		  list.ready = true;
		});

		// when the current page is changed, update local scope vars
		pageRef.page.onPageChange(function(p) {
		  list.currentPage = p;
		});
		
		list.go = function( page ){
			page = ~~page;
			if(page < 1){
				page = 1;
			}
			if(page > list.pageCount){
				page = list.pageCount;
			}
			pageRef.page.setPage(page);
		};
		
		list.next = function(){
			pageRef.page.next();
		};
		
		list.prev = function(){
			pageRef.page.prev();
		};

		// load the first page
		pageRef.page.next();

		return list;
		
	}
  
});

I'm not sure what the problem here is. Going to try and dig into it.